Portion of a golf club head



FIG. 1 is a perspective view of a portion of a golf club head showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a heel side view thereof;

FIG. 4 is a toe side view thereof; and,

FIG. 5 is a rear view thereof.

The broken line showing of the remainder of the club head is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a golf club head, as shown and described. 